An MCP server configuration for Kastell, a tool that appears to manage resources from cloud hosting providers. It requires access tokens for Hetzner, DigitalOcean, Vultr, and Linode, and enables safe mode.

Use it to connect Kastell to those cloud providers, provided the required environment variables and tokens are available.

It gives a coding agent a defined connection to Kastell while keeping potentially risky operations restricted by its safe-mode setting.

kastell — MCP server by kastelldev

Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code

/plugin marketplace add kastelldev/kastell

Claude Code

/plugin install kastell

Installing this writes the configuration, not the program: `node` runs a file from the repository, so clone it first and make the path in the command match where you put it.

Made for: Claude Code.

Or install kastell, the plugin that ships this one along with the rest of its 4 skills, 1 agent, 4 hooks, 1 MCP server.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/mcp/kastelldev/kastell/kastell/github.svg)](https://agentmods.dev/mcp/kastelldev/kastell/kastell)

Your own site

<a href="https://agentmods.dev/mcp/kastelldev/kastell/kastell"><img src="https://agentmods.dev/badge/mcp/kastelldev/kastell/kastell/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/mcp/kastelldev/kastell/kastell"><img src="https://agentmods.dev/badge/mcp/kastelldev/kastell/kastell.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

kastell scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

kastell-plugin/.mcp.json · 15 lines

What it actually says

{
  "kastell": {
    "command": "node",
    "args": [
      "${CLAUDE_PLUGIN_ROOT}/../../dist/mcp-bundle.mjs"
    ],
    "env": {
      "HETZNER_TOKEN": "${HETZNER_TOKEN}",
      "DIGITALOCEAN_TOKEN": "${DIGITALOCEAN_TOKEN}",
      "VULTR_TOKEN": "${VULTR_TOKEN}",
      "LINODE_TOKEN": "${LINODE_TOKEN}",
      "KASTELL_SAFE_MODE": "true"
    }
  }
}

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

1mo ago First seen · 15 lines scan A 64ed07c9e91f

Subscribe to this mod's changes

kastell is an MCP server published in the GitHub repository kastelldev/kastell (60 stars, last pushed 11d ago), licensed Apache-2.0. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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